Re: ./configure --with-native-compilation on macos (11.5.2 Big Sur)

[Alan Third <alan@idiocy.org>]

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On Sat, Aug 21, 2021 at 10:47:54AM +0100, Alan Third wrote:
> On Sat, Aug 21, 2021 at 01:43:17PM +0900, Jean-Christophe Helary wrote:
> > 
> > Apologies. I guess I was under the influence of my second vaccine shot... I forgot to use the --with-native-compilation when I reconfigured after patching...
> > 
> > And the result, with the patch and the flag, is:
> > 
> > checking for gcc_jit_context_acquire in -lgccjit... no
> > configure: error: ELisp native compiler was requested, but libgccjit was not found.
> > Please try installing libgccjit or a similar package.
> > 
> > :(
> 
> Can you send, I think, config.log? There should be an error message
> somewhere from the compiler that may give us a better idea of where
> it's going wrong.

I see this in your config.log:

configure:16825: checking for gcc_jit_context_acquire in -lgccjit
configure:16848: gcc -o conftest -g3 -O2 -I/usr/local/Cellar/libffi/3.3_3/include -I/usr/local/Cellar/librsvg/2.50.7/include/librsvg-2.0 -I/usr/local/Cellar/gdk-pixbuf/2.42.6/include/gdk-pixbuf-2.0 -I/usr/local/Cellar/libpng/1.6.37/include/libpng16 -I/usr/local/Cellar/libtiff/4.3.0/include -I/usr/local/Cellar/glib/2.68.3/include -I/usr/local/Cellar/cairo/1.16.0_5/include/cairo -I/usr/local/Cellar/glib/2.68.3/include -I/usr/local/Cellar/glib/2.68.3/include/glib-2.0 -I/usr/local/Cellar/glib/2.68.3/lib/glib-2.0/include -I/usr/local/opt/gettext/include -I/usr/local/Cellar/pcre/8.45/include -I/usr/local/Cellar/pixman/0.40.0/include/pixman-1 -I/usr/local/Cellar/fontconfig/2.13.1/include -I/usr/local/opt/freetype/include/freetype2 -I/usr/local/Cellar/libpng/1.6.37/include/libpng16 -I/usr/local/Cellar/libxcb/1.14_1/include -I/usr/local/Cellar/libxrender/0.9.10/include -I/usr/local/Cellar/libxext/1.3.4/include -I/usr/local/Cellar/libx11/1.7.2/include -I/usr/local/Cellar/libxcb/1.14_1/include -I/usr/local/Cellar/libxau/1.0.9/include -I/usr/local/Cellar/libxdmcp/1.1.3/include -I/usr/local/Cellar/xorgproto/2021.4/include -I/usr/local/Cellar/libgccjit/11.2.0/include -I   -I/usr/local/opt/readline/include: -L/usr/local/opt/readline/lib: -L/usr/local/Cellar/libgccjit/11.2.0/lib/gcc/11 -L conftest.c -lgccjit    >&5
ld: warning: directory not found for option '-L/usr/local/opt/readline/lib:'
ld: warning: -L path 'conftest.c' is not a directory
ld: warning: dylib (/usr/local/Cellar/libgccjit/11.2.0/lib/gcc/11/libgccjit.so) was built for newer macOS version (11.5) than being linked (11.0)
Undefined symbols for architecture x86_64:
  "_main", referenced from:
     implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

It looks like there's a spare "-L" at end of the gcc flags...

I have a suspicion here. You have both Homebrew and MacPorts
installed. Configure is picking up that you have both of them and is
trying to set up libgcc for both...

Perhaps the attached patch will fix it.
-- 
Alan Third

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From 58940e1d4b53cc3e029b94e2a2e00a5d3f9ff9e1 Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Sun, 5 Sep 2021 14:04:45 +0100
Subject: [PATCH] Don't add flags when MacPorts is installed but GCC isn't

* configure.ac: Check whether there is any value in $PORT_PACKAGE
before trying to use it.
---
 configure.ac | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6d204b6103..fc4cf088ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3840,12 +3840,14 @@ AC_DEFUN
       # instance).
       PORT_PACKAGE=$(port installed active | grep '^ *gcc@<:@0-9@:>@* ' | \
                           awk '{ print $1; }')
-      MACPORTS_LIBGCCJIT_INCLUDE=$(dirname $(port contents $PORT_PACKAGE | \
-                                           grep libgccjit.h))
-      MACPORTS_LIBGCCJIT_LIB=$(dirname $(port contents $PORT_PACKAGE | \
+      if test -n $PORT_PACKAGE; then
+        MACPORTS_LIBGCCJIT_INCLUDE=$(dirname $(port contents $PORT_PACKAGE | \
+                                             grep libgccjit.h))
+        MACPORTS_LIBGCCJIT_LIB=$(dirname $(port contents $PORT_PACKAGE | \
                                               grep libgccjit.dylib))
-      CFLAGS="$CFLAGS -I${MACPORTS_LIBGCCJIT_INCLUDE}"
-      LDFLAGS="$LDFLAGS -L${MACPORTS_LIBGCCJIT_LIB}"
+        CFLAGS="$CFLAGS -I${MACPORTS_LIBGCCJIT_INCLUDE}"
+        LDFLAGS="$LDFLAGS -L${MACPORTS_LIBGCCJIT_LIB}"
+      fi
     fi
 
     # Check if libgccjit is available.
-- 
2.30.2