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@@ -139,3 +139,81 @@ export PKG_CONFIG_PATH=/usr/local/lib64/pkgconfig
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```
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pkg-config will also try to look in `PKG_CONFIG_PATH` to find `gtest_main.pc`.
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### Using pkg-config in a cross-compilation setting
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Pkg-config can be used in a cross-compilation setting too. To do this, let's
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assume the final prefix of the cross-compiled installation will be `/usr`, and
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your sysroot is `/home/MYUSER/sysroot`. Configure and install GTest using
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```
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mkdir build && cmake -DCMAKE_INSTALL_PREFIX=/usr ..
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```
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Install into the sysroot using `DESTDIR`:
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```
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make -j install DESTDIR=/home/MYUSER/sysroot
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```
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Before we continue, it is recommended to **always** define the following two
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variables for pkg-config in a cross-compilation setting:
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```
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export PKG_CONFIG_ALLOW_SYSTEM_CFLAGS=yes
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export PKG_CONFIG_ALLOW_SYSTEM_LIBS=yes
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```
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otherwise `pkg-config` will filter `-I` and `-L` flags against standard prefixes
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such as `/usr` (see https://bugs.freedesktop.org/show_bug.cgi?id=28264#c3 for
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reasons why this stripping needs to occur usually).
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If you look at the generated pkg-config file, it will look something like
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```
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libdir=/usr/lib64
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includedir=/usr/include
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Name: gtest
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Description: GoogleTest (without main() function)
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Version: 1.10.0
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URL: https://github.com/google/googletest
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Libs: -L${libdir} -lgtest -lpthread
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Cflags: -I${includedir} -DGTEST_HAS_PTHREAD=1 -lpthread
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```
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Notice that the sysroot is not included in `libdir` and `includedir`! If you try
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to run `pkg-config` with the correct
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`PKG_CONFIG_LIBDIR=/home/MYUSER/sysroot/usr/lib64/pkgconfig` against this `.pc`
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file, you will get
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```
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$ pkg-config --cflags gtest
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-DGTEST_HAS_PTHREAD=1 -lpthread -I/usr/include
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$ pkg-config --libs gtest
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-L/usr/lib64 -lgtest -lpthread
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```
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which is obviously wrong and points to the `CBUILD` and not `CHOST` root. In
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order to use this in a cross-compilation setting, we need to tell pkg-config to
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inject the actual sysroot into `-I` and `-L` variables. Let us now tell
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pkg-config about the actual sysroot
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```
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export PKG_CONFIG_DIR=
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export PKG_CONFIG_SYSROOT_DIR=/home/MYUSER/sysroot
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export PKG_CONFIG_LIBDIR=${PKG_CONFIG_SYSROOT_DIR}/usr/lib64/pkgconfig
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```
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and running `pkg-config` again we get
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```
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$ pkg-config --cflags gtest
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-DGTEST_HAS_PTHREAD=1 -lpthread -I/home/MYUSER/sysroot/usr/include
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$ pkg-config --libs gtest
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-L/home/MYUSER/sysroot/usr/lib64 -lgtest -lpthread
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```
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which contains the correct sysroot now. For a more comprehensive guide to also
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including `${CHOST}` in build system calls, see the excellent tutorial by Diego
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Elio Pettenò: https://autotools.io/pkgconfig/cross-compiling.html
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Gennadiy Civil