RFR: 8284661: Reproducible assembly builds without relative linking

[Andrew Leonard]

On Mon, 11 Apr 2022 09:43:37 GMT, Andrew Leonard <aleonard at openjdk.org> wrote:

> This PR removes the need for relative object file linking introduced by JDK-8284437 for linux libraries, by specifying
> .file <relative source path> directives in the linux .S source files. The source files specify a .file ASSEMBLY_SRC_FILE
> where ASSEMBLY_SRC_FILE is defined by the NativeCompliation.gmk.
> 
> Signed-off-by: Andrew Leonard <anleonar at redhat.com>

dwarf debuginfo output for the assembly entries now looks good:

< 0><0x0000000b>  DW_TAG_compile_unit
                    DW_AT_stmt_list             0x0022146d
                    DW_AT_low_pc                0x004707c0
                    DW_AT_high_pc               0x00470a40
                    DW_AT_name                  src/hotspot/os_cpu/linux_aarch64/atomic_linux_aarch64.S
                    DW_AT_comp_dir              make/hotspot
                    DW_AT_producer              GNU AS 2.27
                    DW_AT_language              DW_LANG_Mips_Assembler

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PR: https://git.openjdk.java.net/jdk/pull/8177