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Avoid running $(CXX) during build to obtain header file paths

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This reduces the build time somewhat and is particularly noticeable
during rebuilds with few code changes.
This commit is contained in:
Florian Weimer
2016-09-21 10:45:32 +02:00
parent 612148c660
commit fc3e1337be
5 changed files with 39 additions and 6 deletions
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14
configure vendored
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@ -635,6 +635,8 @@ BISON
INSTALL_INFO
PERL
BASH_SHELL
CXX_CMATH_HEADER
CXX_CSTDLIB_HEADER
CXX_SYSINCLUDES
SYSINCLUDES
AUTOCONF
@ -5054,6 +5056,18 @@ fi
# Obtain some C++ header file paths. This is used to make a local
# copy of those headers in Makerules.
if test -n "$CXX"; then
find_cxx_header () {
echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
}
CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
CXX_CMATH_HEADER="$(find_cxx_header cmath)"
fi
# Test if LD_LIBRARY_PATH contains the notation for the current directory
# since this would lead to problems installing/building glibc.
# LD_LIBRARY_PATH contains the current directory if one of the following