From 6181e9c2c5ba252ac016f51903dc35d7bfbbca71 Mon Sep 17 00:00:00 2001 From: Simon Marchi Date: Thu, 11 Jan 2018 21:08:23 -0500 Subject: [PATCH] gdb_compile_shlib: Only consider shlib= options when building executables Trying to use gdb_compile_shlib with the shlib= option to build a shared library that depends on another shared library does not work as of today. See: https://sourceware.org/ml/gdb-patches/2017-10/msg00733.html The problem is that building the lib is done in two steps, compilation (.c -> .o) and linking (.o -> .so) and the shlib= options are passed to both steps. When compiling the object file (.o), it results in gcc complaining: gcc: warning: .../solib-vanish-lib2.so: linker input file unused because linking not done The first solution I came up with was to filter the options inside gdb_compile_shlib to remove the shlib= options from the options we pass when compiling the .o file. I then thought it would be simpler to ignore the shlib= options in gdb_compile when not building an executable (the executable category includes the shared libraries). For other compilation types (object file, preprocess and generate assembly), it doesn't make sense to add shared libraries to the source file list. Regtested on the buildbot. gdb/testsuite/ChangeLog: * lib/gdb.exp (gdb_compile): Ignore shlib= and shlib_load options when not creating an executable. --- gdb/testsuite/ChangeLog | 5 +++++ gdb/testsuite/lib/gdb.exp | 5 +++-- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index d95b144..55b4a31 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2018-01-11 Simon Marchi + + * lib/gdb.exp (gdb_compile): Ignore shlib= and shlib_load + options when not creating an executable. + 2018-01-11 Pedro Alves PR remote/22597 diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp index 7702d9c..a4bde72 100644 --- a/gdb/testsuite/lib/gdb.exp +++ b/gdb/testsuite/lib/gdb.exp @@ -3513,7 +3513,8 @@ proc gdb_compile {source dest type options} { set shlib_found 0 set shlib_load 0 foreach opt $options { - if [regexp {^shlib=(.*)} $opt dummy_var shlib_name] { + if {[regexp {^shlib=(.*)} $opt dummy_var shlib_name] + && $type == "executable"} { if [test_compiler_info "xlc-*"] { # IBM xlc compiler doesn't accept shared library named other # than .so: use "-Wl," to bypass this @@ -3539,7 +3540,7 @@ proc gdb_compile {source dest type options} { lappend new_options "early_flags=-Wl,--no-as-needed" } } - } elseif { $opt == "shlib_load" } { + } elseif { $opt == "shlib_load" && $type == "executable" } { set shlib_load 1 } else { lappend new_options $opt -- 2.7.4