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* [newlib-cygwin] libgloss: build with -nostdinc
@ 2022-02-17 1:30 Michael Frysinger
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From: Michael Frysinger @ 2022-02-17 1:30 UTC (permalink / raw)
To: newlib-cvs
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=e0c0ad8268af60a2413edcab84320eef1e6ce5f9
commit e0c0ad8268af60a2413edcab84320eef1e6ce5f9
Author: Mike Frysinger <vapier@gentoo.org>
Date: Sat Feb 12 01:59:13 2022 -0500
libgloss: build with -nostdinc
We don't want libgloss building against C library headers that happened
to be installed with the toolchain, so add -nostdinc to the build. We
still need access to the compiler internal headers, so probe those and
include them via -isystem. This uses a similar probing style as glibc,
which has used it for over a decade, so it should be safe & stable.
This should prevent any latent bugs due to testing with a toolchain that
is fully configured & installed already.
Diff:
---
libgloss/configure | 20 ++++++++++++++++++++
libgloss/configure.ac | 11 +++++++++++
2 files changed, 31 insertions(+)
diff --git a/libgloss/configure b/libgloss/configure
index abe3a574c..215a5c7a5 100755
--- a/libgloss/configure
+++ b/libgloss/configure
@@ -5104,6 +5104,26 @@ esac
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for compiler search settings" >&5
+$as_echo_n "checking for compiler search settings... " >&6; }
+if ${libc_cv_compiler_isystem+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ for subdir in include include-fixed; do
+ if dir=`$CC -print-file-name=$subdir`; then :
+ if test -n "$dir"; then :
+ libc_cv_compiler_isystem="$libc_cv_compiler_isystem -isystem $dir"
+
+fi
+
+fi
+ done
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_compiler_isystem" >&5
+$as_echo "$libc_cv_compiler_isystem" >&6; }
+CC="$CC -nostdinc $libc_cv_compiler_isystem"
+
host_makefile_frag_path=$host_makefile_frag
diff --git a/libgloss/configure.ac b/libgloss/configure.ac
index 78e92a0e8..06d17d8b5 100644
--- a/libgloss/configure.ac
+++ b/libgloss/configure.ac
@@ -336,6 +336,17 @@ m4_include([mcore/acinclude.m4])
m4_include([mn10300/acinclude.m4])
m4_include([moxie/acinclude.m4])
+AC_CACHE_CHECK([for compiler search settings], libc_cv_compiler_isystem, [dnl
+ for subdir in include include-fixed; do
+ AS_IF([dir=`$CC -print-file-name=$subdir`], [dnl
+ AS_IF([test -n "$dir"], [dnl
+ libc_cv_compiler_isystem="$libc_cv_compiler_isystem -isystem $dir"
+ ])
+ ])
+ done
+])
+CC="$CC -nostdinc $libc_cv_compiler_isystem"
+
dnl We have to assign the same value to other variables because autoconf
dnl doesn't provide a mechanism to substitute a replacement keyword with
dnl arbitrary data or pathnames.
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